Vibration Analysis of Damper Blade by Substructure Synthesis Method

Recently, in order to improve power plant thermal efficiency, the turbine blade, which is the most important element of the power plant, has been used under severe conditions of high loading. Therefore, for the purpose of increasing plant reliability, the blade with friction dampers has been used. This paper presents the analysis method to predict damping characteristics of the damper blades by applying the substructure synthesis method and the harmonic balance method to the bladed disk. In order to verify the validity of the analytical method proposed here, the calculated results by the harmonic balance method are compared with the results by the direct integration method. Also, the model test is carried out and the experimental data are compared with the numerical results. It is found that a large damping effect can be obtained by using the damper elements and the numerical results show good agreement with the experimental data.